02 sunfire: cannot rev pass 3000rpm

[AWDGuy]

Neighbour came over to show me a problem with his car, when in any gear or neutral and floors the gas, it wont go pass 3K. jsut bounces off at 3k, like a speed governor of some sort.

He got the car for free, and its always been like this, he just recently got a CEL, but siad it was because he hit something and it came on. He was in a hurry so I couldnt hook up the scanner to make sure...

Any ideas?

[Jdc]

So when the car's in any gear, when the rpm's climb to 3 grand it does this? So the car bucks and chucks like crazy I guess....... sounds most def like the governer I have experienced on many gm vehicles when you rev in neutral. Check the codes out first would be the best bet. Could be a code in memory (if it does that), that might help.

[AWDGuy]

So when the car's in any gear, when the rpm's climb to 3 grand it does this?

yes, he cant go over 3k on the highway without it kicking back.

I will check the code as soon as he has time.

[NoLimits]

TPS or speed sensor maybe? My 3.8 had a rev limiter if you were in park/neutral, it would go up to 4000 though.
Floormat is not stuck under the gas is it?

Without reading the code we're all just shooting in the dark. Mike said what I was going to say - make sure the speedo works. Otherwise it's probably in limp mode because of a critical sensor, like one of the trigger sensors or something like MAF/MAP.

-Michael

[ImPuLsIvE.ca]

But i thought J-bodies were the bestest cars ever made. WTF. Did this not get 80+ MPG?

http://masklinnscans.free.fr/4chan/fail.jpg

[Jdc]

Obviously if you can't rev past 3 grand your going to get at least 79mpg with a jbody. We're talking Jaguar V12's right?

[-=M=-]

Crank position sensor. Same thing happened on th VW, couldnt get it to rev past 4g and it had problems starting.

[vtecpower101]

clogged cat

[dwarrick]

Hesitation, Sag, Stumble

Hesitation, Sag, Stumble

Checks


Action

DEFINITION: A momentary lack of response when the accelerator is pushed down. The condition can occur at any vehicle speed. The condition is usually more pronounced when the driver first attempts to make the vehicle move, such as acceleration from a stop sign. The condition may cause the engine to stall if severe enough.

Preliminary

• Refer to Diagnostic System Check - Engine Controls .
• Refer to Symptoms - Engine Controls .
• Search for service bulletins.

Sensor/System


Check for the following conditions:
• Proper operation of the manifold absolute pressure (MAP) sensor. Refer to DTC P0105 .
• Proper operation of the throttle position (TP) sensor. Refer to DTC P0105 .
• Proper operation of the engine coolant temperature (ECT) sensor. Refer to DTC P0117 and DTC P0118 .
• Check the oxygen sensor (O2S 1). The O2S 1 should quickly respond to the different throttle positions. If it does not, check the O2S 1 for silicon, or for other contaminants from the fuel or from the use of an improper RTV sealant. The sensor may have a white powdery coating. Silicon contamination causes a high but false O2S 1 signal voltage, indicating a rich exhaust indication. The PCM will reduce the amount of fuel delivered to the engine, causing a severe driveability problem.

Fuel System


Check for the following conditions:
• The fuel pressure--Refer to Fuel System Diagnosis .
• Contaminated fuel--Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
• The fuel injectors--Refer to Fuel Injector Coil Test .
• Conditions which can cause an engine to run rich, indicating that the long-term fuel trim is significantly in the negative range. Refer to Diagnostic Aids for DTC P0172 .
• Conditions that can cause an engine to run lean, indicating that the long-term fuel trim is significantly in the positive range. Refer to Diagnostic Aids for DTC P0171 .
• Proper operation of the evaporative emission (EVAP) control system. Refer to Evaporative Emission (EVAP) Control System Description .

Ignition System


Check for the following conditions:
• Proper ignition voltage output--Use the J 36012-A Spark Plug Jumper Wires and use the J 26792 Spark Tester, or equivalent.
• Check the spark plugs for the following conditions:
- Wet or fuel-fouled spark plugs
- Cracks on the spark plugs
- Wear
- Improper spark plug gap
- Burned electrodes or heavy deposits
- Heavy deposits
• If the spark plugs are fuel or oil-fouled, determine the cause of the fouling before you replace the spark plugs.
• The ignition control module (ICM) for proper ground connection
• The ignition coils for cracks or for carbon tracking

Additional Checks


Check for the following conditions:
• Proper operation of the automatic transaxle. Refer to Road Test Procedure in Automatic Transmission 4T40-E/4T45-E.
• The generator output voltage--Repair the generator if the output voltage is less than 11 volts, or more than 16 volts.
• If you have completed all of the procedures, and if you have found no malfunctions, review the following items:
- Inspect all electrical connections within the suspected circuit and/or systems.
- Check the scan tool data. Refer to Scan Tool Data List .